.nav-pic {
    width: 100%;
    height: 500px;
    background-image: url(../../imgs/products.png);
    background-position: center;
    background-repeat:  no-repeat;
    background-size: cover;
}
.knows {
    margin: 0 0 50px 0;
    width: 100%;
    height: 250px;
    background: #F3F3F3;
}
.knows-title {
    margin: 0;
    background-position: 60px 15px;
    background-image: url(../../imgs/product_know.png);
}
.foot-product{
    padding: 35px 0 0 30px;
    box-sizing: border-box;
    counter-reset: show-list;
}
.foot-product p {
    position: relative;
    font-weight: bold;
    line-height: 30px;
    color: #333;
    counter-increment: item;
}
.foot-product p::before {
    content: counter(item)"、";
    display: block;
    position: absolute;
    left: -20px;
    top:0;
}

.type {
    display: flex;
    justify-content: space-between;
    font-size: 20px;
    font-weight: bold;
}
.type img {
    display: block;
    width: 230px;
    height: 230px;
    border: 1px dashed #999;
}
.type > div:first-of-type {
    position: relative;
    margin-left: 150px;
}
.type > div:last-of-type {
    position: relative;
    margin-right: 150px;
}
.type .mark::before {
    position: absolute;
    top: 112px;
    left: -10px;
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background:#333333;
}
.type .mark::after {
    position: absolute;
    top: 50%;
    right: -82px;
    content: '';
    display: block;
    width: 340px;
    height: 2px;
    background:#333333;
}

.type .blank::before {
    position: absolute;
    top: 112px;
    right: -10px;
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background:#333333;
}
.type .blank::after {
    position: absolute;
    top: 50%;
    left: -82px;
    content: '';
    display: block;
    width: 340px;
    height: 2px;
    background:#333333;
}
.pro-introduce {
    margin-bottom: 50px;
    display: flex;
    justify-content: space-between;
    text-align: center;
}
.mark p:first-of-type, .blank p:first-of-type{
    line-height: 50px;
    margin-top: 55px;
}
.mark p:last-of-type , .blank p:last-of-type{
    margin-top: 30px;
}
.pro-introduce img {
    display: block;
    width: 200px;
    height: 400px;
}
.pro-introduce p {
    line-height: 60px;
}
.product-top {
    position: relative;
    margin-bottom: 50px;
    padding: 0 0 100px;
}
.mt100 {
    margin-top: 150px;
    margin-bottom: 60px;
}
.pro-line {
    position: absolute;
    top: 424px;
    left: 50%;
    margin-left: -1px;
    height: 340px;
    width: 2px;
    background: #333;
}
.pro-line::after {
    content: '';
    display: block;
    position: absolute;
    bottom: 0;
    left: -4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #333;
}
.type > div.mony:first-of-type {
    margin-left: 320px;
}
.type > div.people:last-of-type {
    margin-top: 120px;
    margin-right: 320px;
}